(19)
(11) EP 0 863 666 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.07.1999 Bulletin 1999/30

(43) Date of publication A2:
09.09.1998 Bulletin 1998/37

(21) Application number: 98102638.8

(22) Date of filing: 16.02.1998
(51) International Patent Classification (IPC)6: H04N 5/21
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 03.03.1997 JP 61740/97

(71) Applicant: KABUSHIKI KAISHA KENWOOD
Shibuya-ku Tokyo (JP)

(72) Inventor:
  • Asami, Toru
    Machida-shi, Tokyo (JP)

(74) Representative: Patentanwälte Leinweber & Zimmermann 
Rosental 7
80331 München
80331 München (DE)

   


(54) Multi-dimensional video filters


(57) An S/N ratio is improved and flicker noises and mosquito noises are suppressed while deterioration of a resolution is suppressed. A three-dimensional cyclical digital filter (16) is interposed between a MPEG video decoder (12) and a video DAC. In accordance with a luminance input signal Yu from the MPEG video decoder (12), Yv is calculated from the following equation.

where K is a value in the range of 0 ≤ K < 1, Ft is a present Yu input value, and F(t-1) is a one-frame preceding Yv.





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